Suction cup



FIG. 1 is a perspective view of my suction cup;

FIG. 2 is a top plan view of my suction cup;

FIG. 3 is a front view of my suction cup the rear view being a mirror image thereof;

FIG. 4 is a bottom view of my suction cup; and,

FIG. 5 is a side view of my section cup. 

The ornamental design for a suction cup, as shown and described. 